The AirPods will begin charging as soon as they are in the charging case. It does not make any difference, whether the case lid is open or close.
Yes, you can use Apple Airpods with any Android mobile phones, which has at least Bluetooth 4.0 connectivity option.
Absolutely fantastic. You will also get slight more bass when you listen to music.
The standard packaging includes, AirPods (in the charging case), Quick start guide and a lightning cable.
Look past their offbeat design and you'll find that Apple AirPods' compact size and high convenience factor are a winning combination.